What is a Credit Spread
Why does one company have to pay far higher interest than the government when it borrows money? That single 'interest difference' captures how scared the market is right now.
Credit spread = corporate bond yield − government bond yield
The credit spread sounds hard by name but its meaning is very simple. It is the corporate bond yield of the same maturity minus the government (sovereign) bond yield.
For example, if a 3-year corporate bond yields 6% while a 3-year government bond of the same maturity yields 3%, the credit spread is 3 percentage points. In finance this is called 300bp (basis points), where 1 percentage point is 100bp.
Why compare with government bonds? A nation can collect taxes and rarely goes bankrupt, so government bonds are seen as 'bonds with almost no default worry (risk-free bonds).' So 'how much extra a company must add on top of the government' becomes that company's risk value.
Don't compare corporate and government bonds of different maturities. A 3-year bond must be matched against a 3-year government bond, and a 10-year against a 10-year, so that only the pure 'credit risk' remains.
What this number contains is 'default risk'
A widening credit spread means investors are thinking, 'this company might not be able to pay back its debt.' Because the risk looks greater, they demand higher interest.
So the lower a company's credit rating, the larger its spread. Companies rated as safe (investment grade) typically move around 50–150bp in normal times, and historically have hovered around an average of about 130bp. High-yield (speculative grade) bonds with large default risk are far larger than this and fluctuate more.
In short, the credit spread expresses in numbers 'how much extra I need to receive to feel at ease for lending money and trusting this company.'
The 50–150bp for investment-grade and average of 130bp are rough ranges based on U.S. corporate bond indexes. They vary by period, index, and measurement method, so treat them as reference figures to get a feel, not absolute standards.
Widening and narrowing — the market's thermometer
The credit spread is a thermometer that measures the market's fear and calm.
When the spread widens, it's a signal that investors fear risk. Spreads tend to widen sharply when recession worries grow or a crisis approaches. That's why it's also used as a leading indicator that signals the economy in advance.
Conversely, when the spread narrows, it means the market is comfortably accepting risk. When the economy is good and money circulates well, spreads thin out.
Looking at stock prices alone, it's easy to miss 'is the mood good right now?', but the credit spread is a warning quietly sent by the bond market, so looking at both lets you read the market's temperature more fully.
Spread explosions in history — 2008 vs 2020
Seeing how credit spreads actually moved during crises makes it click. A representative example is the spread on U.S. high-yield bonds (ICE BofA US High Yield OAS).
During the 2008 global financial crisis, the spread exploded to roughly around 20 percentage points (2000bp) in mid-December. A number that usually played in the 2–5 percentage point range soared that high at the peak of the crisis. Recovery took quite a long time too.
During the 2020 COVID shock, the spread spiked to roughly 11 percentage points (about 1100bp) in late March. It was lower than 2008 but the speed was much faster, and as the central bank stepped in with the unusual move of even buying corporate bonds, it settled quickly within a few months.
Both crises share the trait that 'the moment the spread widens is the most frightening moment and, at the same time, the moment risk was rewarded most greatly.'
The figures above shift slightly depending on the index and measurement method (daily/monthly), so they are written as 'roughly ~ range.' The 2008 peak is reported at about 19.9–21.8 percentage points depending on the source. This is only a past record and does not guarantee the drawdown or recovery speed of the future.
Frequently Asked Questions
Q. Is a large credit spread always bad?
Rather than splitting it neatly into 'bad/good,' it's more accurate to see it as a signal that 'risk is large.' A large spread means the default risk is that much greater, but at the same time it means higher interest is paid as compensation for taking that risk. Risk and reward are two sides of the same number.
Q. Why compare specifically with government bonds?
A nation can collect taxes, so it rarely reaches the point of being unable to repay its debt. So government bonds are set as the 'baseline with almost no default worry (risk-free),' and you measure how much more a company adds on top. Only when the baseline is solid can you cleanly extract the pure 'credit risk.'
Q. Why should an individual investor know about credit spreads?
When the spread widens sharply, it can be a signal that the bond market has sensed a crisis first. It becomes a supplementary indicator for reading the market's tension that is easy to miss when looking only at stock prices. That said, this isn't a signal for 'when to buy or sell'; it's best used as a reference tool to understand the current market mood.
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